MEMPHIS - Contractors work in the engine compartment of the Coast Guard Cutter Scioto during a drydock period to replace its Catepillar 353 main diesel engines, June 22, 2011. The Scioto, a 65-foot river buoy tender homeported in Keokuk, Iowa, is scheduled to resume operations on the Mississippi River in late September. U.S. Coast Guard photo by Master Chief Petty Officer Michael Ellis.